1869, Otto, 3d deep lilac, trial printing (second essay), Luff "M" plate, unused imperforate with close to very large margins, fresh printing, fine condition; a scarce stamp as the only recorded unused example from the "M" plate; cert. PFSA (1998), (SG £550+). (Image)

1869, Otto, 6d pale-ultramarine, imperforate, mint with large part original gum, showing dramatic "white plate flaw", four margins, vibrant colour, a rare Otto error (SG £450 as a single with no variety). (Image)

1876, 6d deep-blue on coarse soft white paper. imperforate horizontal pair, mint with original gum, good to large margins, left pane position 15-16, with 15 clearly showing the major plate flaw of the "obliterated 'K' of 'Republiek'", very clean and fresh example in superb condition; signed Kohl. (Image)

1879, Stamp Commission overprints, 3d mauve on green, no watermark, imperforate, four margin fine used, showing non constant variety "missing first 'a' of Transvaal", neatly cancelled by Pretoria numeral '1' target cancel, a rare example with just a handful known; cert. BPA (1994) (Image)

1895, Postal Fiscal, 6d bright-rose, mint with original gum, strip of three with overprint error on the middle stamps "P" instead of "POSTZEGEL" in green, some perforation separation and hinge reinforcement, a scarce and spectacular error and probably unique; cert. BPA (1991). (Image)

1903, £5 orange-brown and violet, mint with original gum, overprinted "Specimen" in black, beautifully centred, strong colour, vibrant impression, stunning appearance, scarce and exceptionally fine. (Image)

1905-09 1d scarlet with error wmk cabled anchor (Cape of Good Hope type), used with Johannesburg cds, tiny surface scuff at top right, fine and very scarce, cert. PF (1948) (S.G. £350). (Image)